<template>

  <div class="app-container">

    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="最终发布"/>
    </el-steps>

    <el-button type="text" @click="openChapterDialog()">添加章节</el-button>
   <!-- 章节 -->
    <ul class="chanpterList">
        <li
            v-for="chapter in chapterVideoList"
            :key="chapter.id">
            <p>
                {{ chapter.title }}
                <span class='acts'>
                   <el-button type="text" @click="openVideo(chapter.id)">添加小节</el-button>
                  <el-button type="text" @click="openEditChapter(chapter.id)">编辑</el-button>
                  <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
                </span>
            </p>

            <!-- 视频 -->
            <ul class="chanpterList videoList">
                <li
                    v-for="video in chapter.children"
                    :key="video.id">
                    <p>{{ video.title }}

                       <span class='acts'>
                  <el-button type="text" @click="openEditVideo(video.id)">编辑</el-button>
                  <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                </span>
                    </p>
                </li>
            </ul>
        </li>
    </ul>
    <div>
        <el-button @click="previous">上一步</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
    </div>

    <!-- 添加和修改章节表单 -->
      <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
          <el-form :model="chapter" label-width="120px">
              <el-form-item label="章节标题">
                  <el-input v-model="chapter.title"/>
              </el-form-item>
              <el-form-item label="章节排序">
                  <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
              </el-form-item>
          </el-form>
          <div slot="footer" class="dialog-footer">
              <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
              <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
          </div>
      </el-dialog>

      <!-- 添加和修改课时表单 -->
      <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
        <el-form :model="video" label-width="120px">
          <el-form-item label="课时标题">
            <el-input v-model="video.title"/>
          </el-form-item>
          <el-form-item label="课时排序">
            <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
          </el-form-item>
          <el-form-item label="是否免费">
            <el-radio-group v-model="video.isFree">
              <el-radio :label="0">免费</el-radio>
              <el-radio :label="1">默认</el-radio>
            </el-radio-group>
          </el-form-item>


        <el-form-item label="上传视频">
        <el-upload
              :on-success="handleVodUploadSuccess"
              :on-remove="handleVodRemove"
              :before-remove="beforeVodRemove"
              :on-exceed="handleUploadExceed"
              :file-list="fileList"
              :action="BASE_API+'/eduvod/video/uploadAliyunVideo'"
              :limit="1"
              class="upload-demo">
        <el-button size="small" type="primary">上传视频</el-button>
        <el-tooltip placement="right-end">
            <div slot="content">最大支持1G，<br>
                支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
            <i class="el-icon-question"/>
        </el-tooltip>
        </el-upload>
    </el-form-item>
      
        </el-form>
        <div slot="footer" class="dialog-footer">
          <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
          <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
        </div> 
      </el-dialog>

  </div>
</template>

<script>
import chapter from '@/api/edu/chapter'
import video from '@/api/edu/video'

export default {
   data(){
       return{
           saveBtnDisabled:false ,//保存按钮是否禁用
           saveVideoBtnDisabled:false,
           courseId:'',//课程id
           chapterVideoList:[],
           chapter:{//封装章节的数据
            title:'',
            sort:0
           },
           video:{//封装小节的数据
             title:'',
             sort:0,
             free:0,
             videoSourceId:'',//云端视频资源
             videoOriginalName:''//视频名称
           },
           dialogChapterFormVisible:false,//章节弹框的值
           dialogVideoFormVisible:false,//小节弹框的值
           BASE_API:process.env.BASE_API,//接口api地址
           fileList:[]//文件列表
       }
   },
   created(){
     //获取到路由的id值
     if(this.$route.params && this.$route.params.id){
       this.courseId = this.$route.params.id
       //根据课程id获取章节和小节信息
       this.getChapterVideo()
     }
     
   },
   methods:{
     beforeVodRemove(file,fileList){
       //点击× 删除前调用的方法
       return this.$confirm(`确定移除 ${file.name}?`);
     },
     handleVodRemove(){
       //点击确定调用的方法
       //调用接口中的删除方法
       video.deleteAlyVideo(this.video.videoSourceId)
       .then(response=>{
         //提示信息
         this.$message({
           type:'success',
           message:'删除成功'
         })
         //文件列表清空
         this.fileList=[]
         //把video中 视频id和名称清空
         this.video.videoSourceId=''
         this.video.videoOriginalName=''
       })
     },
     //上传视频成功调用的方法
     handleVodUploadSuccess(response,file,fileList){
       //上传视频id赋值
        this.video.videoSourceId = response.data.videoId
        //上传视频名称赋值（file.name 代表文件的名称 elementui中封装)
        this.video.videoOriginalName = file.name
     },
     //上传之前的方法
     handleUploadExceed(){
       this.$message.warning('想要重新上传视频，请先删除已上传的视频')
     },
     //===========================针对小节的操作================================
      //编辑小节
    updateVideo(){
      //关闭弹框
      this.dialogVideoFormVisible=false
      //调用方法
      video.updateVideo(this.video)
      .then(response=>{
        //提示信息
        this.$message({
          type:'success',
          message:'修改小节信息成功'
        })
        //刷新页面
         this.getChapterVideo()
      })
    },
    //编辑小节的弹框
    openEditVideo(videoId){
      this.dialogVideoFormVisible=true
      video.getVideoById(videoId)
      .then(response=>{//数据回显
        this.video=response.data.video
      })
    },
     //删除小节
     removeVideo(videoId){
       this.$confirm('此操作将删除讲小节信息, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(()=>{//点击确定，执行then方法
           video.deleteVideo(videoId)
           .then(response=>{
             this.$message({
               type:'success',
               message:'删除小节成功'
             })
             //刷新页面
             this.getChapterVideo()
           })
        })
     },
     //添加小节弹框
     openVideo(chapterId){
       //弹框
       this.dialogVideoFormVisible=true
       //设置章节id到video中
       this.video.chapterId=chapterId
       //表单数据清空
       this.video.id=''
       this.video.title=''
       this.video.sort=0
       this.video.free=0
       //文件列表清空
         this.fileList=[]
         //把video中 视频id和名称清空
         this.video.videoSourceId=''
         this.video.videoOriginalName=''

     },
     //添加小节
     addVideo(){
       //设置课程ID
       this.video.courseId = this.courseId
       video.addVideo(this.video)
       .then(response=>{
         //关闭弹框
         this.dialogVideoFormVisible=false
         //提示信息
         this.$message({
           type:'success',
           message:'添加小节成功'
         })
         //刷新页面
         this.getChapterVideo()
       })
     },
     saveOrUpdateVideo(){
       if(this.video.id){
         this.updateVideo()
       }else{
         this.addVideo()
       }
     },
     //===========================针对章节的操作================================
     //删除章节
     removeChapter(chapterId){
        this.$confirm('此操作将删除讲章节信息, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(()=>{//点击确定，执行then方法
         chapter.deleteChapter(chapterId)
          .then(response=>{//删除成功
           this.$message({
             type:'success',
             message:'删除成功'
           })

           //刷新页面
           this.getChapterVideo()
          })
        })
     },
     //修改章节弹框做数据回显
     openEditChapter(chapterId){
       //弹框
        this.dialogChapterFormVisible=true
        //调用接口
       chapter.getChapter(chapterId)
       .then(response=>{
        this.chapter= response.data.chapter
       })
      },

     //弹出添加章节的弹框
     openChapterDialog(){
       //弹框
       this.dialogChapterFormVisible=true
       //表单数据清空
       this.chapter.title=''
       this.chapter.sort=0

     },
     //修改章节
     updateChapter(){
       chapter.updateChapter(this.chapter)
       .then(response=>{
         //1.关闭弹框
          this.dialogChapterFormVisible=false
          //2.提示信息
          this.$message({
            type:'success',
            message:'修改章节成功'
          })
          //3.刷新页面
          this.getChapterVideo()
       })

     },
     //添加章节
     addChapter(){
        //设置课程id到chapter对象中
        this.chapter.courseId=this.courseId
        chapter.addChapter(this.chapter)
        .then(response=>{
          //1.关闭弹框
          this.dialogChapterFormVisible=false
          //2.提示信息
          this.$message({
              type:'success',
              message:'添加章节成功'
          })
          //3.刷新页面
          this.getChapterVideo()
        })
     },

     saveOrUpdate(){
       if(this.chapter.id){
         this.updateChapter()
       }else{
         this.addChapter()
       }
     },
     //根据课程id查询章节和小节的列表
     getChapterVideo(){
       chapter.getAllChapterVideo(this.courseId)
       .then(response=>{
         this.chapterVideoList = response.data.allChapterVideo
       })
     },
       previous(){
           this.$router.push({path:'/course/info/'+this.courseId})
       },
       next(){
           this.$router.push({path:'/course/publish/'+this.courseId})
       }
   }
}
</script>
<style scoped>
.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li{
  position: relative;
}
.chanpterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}

.videoList{
  padding-left: 50px;
}
.videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}

</style>